English verb conjugation
COULD FUEL

Regular verb: fuel - fuelled - fuelled

Affirmation

Simple form	V-ing form
I could fuel you could fuel he could fuel we could fuel you could fuel they could fuel	I could be fuelling you could be fuelling he could be fuelling we could be fuelling you could be fuelling they could be fuelling
Perfect	V-ing perfect
I could have fuelled you could have fuelled he could have fuelled we could have fuelled you could have fuelled they could have fuelled	I could have been fuelling you could have been fuelling he could have been fuelling we could have been fuelling you could have been fuelling they could have been fuelling

Negation

Simple form	V-ing form
I could not fuel you could not fuel he could not fuel we could not fuel you could not fuel they could not fuel	I could not be fuelling you could not be fuelling he could not be fuelling we could not be fuelling you could not be fuelling they could not be fuelling
Perfect	V-ing perfect
I could not have fuelled you could not have fuelled he could not have fuelled we could not have fuelled you could not have fuelled they could not have fuelled	I could not have been fuelling you could not have been fuelling he could not have been fuelling we could not have been fuelling you could not have been fuelling they could not have been fuelling

Interrogative form

Simple form	V-ing form
could I fuel? could you fuel? could he fuel? could we fuel? could you fuel? could they fuel?	could I be fuelling? could you be fuelling? could he be fuelling? could we be fuelling? could you be fuelling? could they be fuelling?
Perfect	V-ing perfect
could I have fuelled? could you have fuelled? could he have fuelled? could we have fuelled? could you have fuelled? could they have fuelled?	could I have been fuelling? could you have been fuelling? could he have been fuelling? could we have been fuelling? could you have been fuelling? could they have been fuelling?

Interro-negative form

Simple form	V-ing form
could I not fuel? could you not fuel? could he not fuel? could we not fuel? could you not fuel? could they not fuel?	could I not be fuelling? could you not be fuelling? could he not be fuelling? could we not be fuelling? could you not be fuelling? could they not be fuelling?
Perfect	V-ing perfect
could I not have fuelled? could you not have fuelled? could he not have fuelled? could we not have fuelled? could you not have fuelled? could they not have fuelled?	could I not have been fuelling? could you not have been fuelling? could he not have been fuelling? could we not have been fuelling? could you not have been fuelling? could they not have been fuelling?